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                <h3 id="HTTP-协议"><a href="#HTTP-协议" class="headerlink" title="HTTP 协议"></a>HTTP 协议</h3><p>URL -&gt; (HTTP) -&gt;<a target="_blank" rel="noopener" href="https://www.yuque.com/httishere/running/hr55oy">HTML -&gt;( parse) -&gt; DOM</a> -&gt; <a target="_blank" rel="noopener" href="https://www.yuque.com/httishere/running/ur0kri">(CSS computing) </a>-&gt; DOM with CSS -&gt; layout -&gt;DOM with position -&gt;(render) -&gt; Bitmap</p>
<p><img src="https://gitee.com/httishere/blog-image/raw/master/img/%E6%B5%8F%E8%A7%88%E5%99%A8.png#id=iVkUm&amp;originHeight=322&amp;originWidth=2930&amp;originalType=binary∶=1&amp;status=done&amp;style=none" alt=""></p>
<p><img src="https://gitee.com/httishere/blog-image/raw/master/img/Xnip2021-09-01_15-46-45.jpg#id=CXWLp&amp;originHeight=636&amp;originWidth=936&amp;originalType=binary∶=1&amp;status=done&amp;style=none" alt=""></p>
<h4 id="TCP-与-IP-的基础知识"><a href="#TCP-与-IP-的基础知识" class="headerlink" title="TCP 与 IP 的基础知识"></a>TCP 与 IP 的基础知识</h4><ul>
<li>流</li>
<li>端口</li>
<li>require(‘net’)</li>
<li>包</li>
<li>IP 地址</li>
<li>libnet/libpcap</li>
</ul>
<h3 id="Toy-Browser"><a href="#Toy-Browser" class="headerlink" title="Toy-Browser"></a>Toy-Browser</h3><p><a target="_blank" rel="noopener" href="https://datatracker.ietf.org/doc/html/rfc2616/">RFC2616</a></p>
<h4 id="request"><a href="#request" class="headerlink" title="request"></a>request</h4><ul>
<li>Request line (POST / HTTP/1.1)<br><img src="https://gitee.com/httishere/blog-image/raw/master/img/image-20210913170214302.png#id=ymGQa&amp;originHeight=246&amp;originWidth=500&amp;originalType=binary∶=1&amp;status=done&amp;style=none" alt=""></li>
<li>headers<ul>
<li>Host: 127.0.0.1</li>
<li>Content-Type: application/x-www-form-urlencoded</li>
<li>(空行)</li>
</ul>
</li>
<li>body (filed=xxx&amp;code=xxx)</li>
</ul>
<h4 id="response"><a href="#response" class="headerlink" title="response"></a>response</h4><ul>
<li>Status line (HTTP/1.1 200 OK)</li>
<li>headers<ul>
<li>Content-Type: text/html</li>
<li>Date: Mon, 13 Sep 2021 10:13:57 GMT</li>
<li>Connection: keep-alive</li>
<li>Transfer-Encoding: chunked</li>
<li>(空行)</li>
</ul>
</li>
<li>body<ul>
<li>26 (body 字符数)</li>
<li><code>&lt;html&gt;&lt;body&gt;Hello World&lt;/body&gt;&lt;/html&gt;</code></li>
<li>0</li>
<li>(空行)</li>
</ul>
</li>
</ul>
<h4 id="简易-server-和-client"><a href="#简易-server-和-client" class="headerlink" title="简易 server 和 client"></a>简易 server 和 client</h4><pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// server.js</span>
<span class="token keyword">const</span> http <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"http"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">const</span> server <span class="token operator">=</span> http<span class="token punctuation">.</span><span class="token function">createServer</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">req<span class="token punctuation">,</span> res</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"request received"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  res<span class="token punctuation">.</span><span class="token function">setHeader</span><span class="token punctuation">(</span><span class="token string">"Content-Type"</span><span class="token punctuation">,</span> <span class="token string">"text/html"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  res<span class="token punctuation">.</span><span class="token function">setHeader</span><span class="token punctuation">(</span><span class="token string">"x-Foo"</span><span class="token punctuation">,</span> <span class="token string">"bar"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  res<span class="token punctuation">.</span><span class="token function">writeHead</span><span class="token punctuation">(</span><span class="token number">200</span><span class="token punctuation">,</span> <span class="token punctuation">&#123;</span> <span class="token string-property property">"Content-Type"</span><span class="token operator">:</span> <span class="token string">"text/plain"</span> <span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  res<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token string">"ok"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

server<span class="token punctuation">.</span><span class="token function">listen</span><span class="token punctuation">(</span><span class="token number">8088</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// client.js</span>
<span class="token keyword">const</span> net <span class="token operator">=</span> <span class="token function">require</span><span class="token punctuation">(</span><span class="token string">"net"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token keyword">const</span> client <span class="token operator">=</span> net<span class="token punctuation">.</span><span class="token function">createConnection</span><span class="token punctuation">(</span>
  <span class="token punctuation">&#123;</span>
    <span class="token literal-property property">host</span><span class="token operator">:</span> <span class="token string">"127.0.0.1"</span><span class="token punctuation">,</span>
    <span class="token literal-property property">port</span><span class="token operator">:</span> <span class="token number">8088</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
    <span class="token comment">// 'connect' listener.</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"connected to server!"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    client<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"POST / HTTP/1.1\r\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    client<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Host: 127.0.0.1\r\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    client<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Content-Length: 19\r\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

    client<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"Content-Type: application/x-www-form-urlencoded\r\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    client<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"\r\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    client<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"filed=xxxx&amp;code=xxx\r\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    client<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token string">"\r\n"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
client<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">"data"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>data<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  client<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
client<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">"end"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"disconnected from server"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
client<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">"error"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">error</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>error<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  client<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>PS:</p>
<ul>
<li>HTTP 是一个文本协议；</li>
</ul>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// Request</span>
<span class="token keyword">class</span> <span class="token class-name">Request</span> <span class="token punctuation">&#123;</span>
  <span class="token comment">// method, url = host + port + path</span>
  <span class="token comment">// body: key-value</span>
  <span class="token comment">// headers</span>
  <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token parameter">options</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>method <span class="token operator">=</span> options<span class="token punctuation">.</span>method <span class="token operator">||</span> <span class="token string">"GET"</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>host <span class="token operator">=</span> options<span class="token punctuation">.</span>host<span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>port <span class="token operator">=</span> options<span class="token punctuation">.</span>port <span class="token operator">||</span> <span class="token number">80</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>path <span class="token operator">=</span> options<span class="token punctuation">.</span>path <span class="token operator">||</span> <span class="token string">"/"</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>body <span class="token operator">=</span> options<span class="token punctuation">.</span>body <span class="token operator">||</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>headers <span class="token operator">=</span> options<span class="token punctuation">.</span>headers <span class="token operator">||</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span><span class="token string">"Content-Type"</span><span class="token punctuation">]</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span><span class="token string">"Content-Type"</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token string">"application/x-www-form-urlencoded"</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span><span class="token string">"Content-Type"</span><span class="token punctuation">]</span> <span class="token operator">===</span> <span class="token string">"application/json"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>bodyText <span class="token operator">=</span> <span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>body<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span><span class="token string">"Content-Type"</span><span class="token punctuation">]</span> <span class="token operator">===</span> <span class="token string">"application/x-www-form-urlencoded"</span>
    <span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>bodyText <span class="token operator">=</span> Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>body<span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">key</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span>key<span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token string">=</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span><span class="token function">encodeURIComponent</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>body<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">"&amp;"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span><span class="token string">"Content-Length"</span><span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>bodyText<span class="token punctuation">.</span>length<span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">return</span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span><span class="token keyword">this</span><span class="token punctuation">.</span>method<span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token string"> </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span><span class="token keyword">this</span><span class="token punctuation">.</span>path<span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token string"> HTTP/1.1\r
</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span>Object<span class="token punctuation">.</span><span class="token function">keys</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">key</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span>key<span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token string">: </span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span><span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span>key<span class="token punctuation">]</span><span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
  <span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">"\r\n"</span><span class="token punctuation">)</span><span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token string">\r
\r
</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">$&#123;</span><span class="token keyword">this</span><span class="token punctuation">.</span>bodyText<span class="token interpolation-punctuation punctuation">&#125;</span></span><span class="token template-punctuation string">`</span></span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token function">send</span><span class="token punctuation">(</span><span class="token parameter">connection</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">return</span> <span class="token keyword">new</span> <span class="token class-name">Promise</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token parameter">resolve<span class="token punctuation">,</span> reject</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>connection<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        connection<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
        connection <span class="token operator">=</span> net<span class="token punctuation">.</span><span class="token function">createConnection</span><span class="token punctuation">(</span>
          <span class="token punctuation">&#123;</span>
            <span class="token literal-property property">host</span><span class="token operator">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>host<span class="token punctuation">,</span>
            <span class="token literal-property property">port</span><span class="token operator">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>port<span class="token punctuation">,</span>
          <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
          <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
            connection<span class="token punctuation">.</span><span class="token function">write</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
          <span class="token punctuation">&#125;</span>
        <span class="token punctuation">)</span><span class="token punctuation">;</span>
        connection<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">"data"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
          <span class="token function">resolve</span><span class="token punctuation">(</span>data<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
          connection<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        connection<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">"end"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
          console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"end..."</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        connection<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">"error"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">error</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
          <span class="token function">reject</span><span class="token punctuation">(</span>error<span class="token punctuation">)</span><span class="token punctuation">;</span>
          connection<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>

<span class="token keyword">class</span> <span class="token class-name">Response</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span>

<span class="token keyword">void</span> <span class="token punctuation">(</span><span class="token keyword">async</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">let</span> request <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Request</span><span class="token punctuation">(</span><span class="token punctuation">&#123;</span>
    <span class="token literal-property property">method</span><span class="token operator">:</span> <span class="token string">"POST"</span><span class="token punctuation">,</span>
    <span class="token literal-property property">host</span><span class="token operator">:</span> <span class="token string">"localhost"</span><span class="token punctuation">,</span>
    <span class="token literal-property property">port</span><span class="token operator">:</span> <span class="token number">8088</span><span class="token punctuation">,</span>
    <span class="token literal-property property">path</span><span class="token operator">:</span> <span class="token string">"/"</span><span class="token punctuation">,</span>
    <span class="token literal-property property">headers</span><span class="token operator">:</span> <span class="token punctuation">&#123;</span>
      <span class="token punctuation">[</span><span class="token string">"X-Foo2"</span><span class="token punctuation">]</span><span class="token operator">:</span> <span class="token string">"customed"</span><span class="token punctuation">,</span>
    <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
    <span class="token literal-property property">body</span><span class="token operator">:</span> <span class="token punctuation">&#123;</span>
      <span class="token literal-property property">name</span><span class="token operator">:</span> <span class="token string">"httishere"</span><span class="token punctuation">,</span>
    <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">let</span> response <span class="token operator">=</span> <span class="token keyword">await</span> request<span class="token punctuation">.</span><span class="token function">send</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>response<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// Response</span>
<span class="token keyword">class</span> <span class="token class-name">ResponseParser</span> <span class="token punctuation">&#123;</span>
  <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_STATUS_LINE</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_STATUS_LINE_END</span> <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span> <span class="token comment">// \r</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_NAME</span> <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_SPACE</span> <span class="token operator">=</span> <span class="token number">3</span><span class="token punctuation">;</span> <span class="token comment">// \r</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_VALUE</span> <span class="token operator">=</span> <span class="token number">4</span><span class="token punctuation">;</span> <span class="token comment">// \r</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_LINE_END</span> <span class="token operator">=</span> <span class="token number">5</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_BLOCK_END</span> <span class="token operator">=</span> <span class="token number">6</span><span class="token punctuation">;</span> <span class="token comment">// 有两个换行</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY</span> <span class="token operator">=</span> <span class="token number">7</span><span class="token punctuation">;</span>

    <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_STATUS_LINE</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>statusLine <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>headers <span class="token operator">=</span> <span class="token punctuation">&#123;</span><span class="token punctuation">&#125;</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>headerName <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>headerValue <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>bodyParser <span class="token operator">=</span> <span class="token keyword">null</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token keyword">get</span> <span class="token function">isFinished</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">return</span> <span class="token keyword">this</span><span class="token punctuation">.</span>bodyParser <span class="token operator">&amp;&amp;</span> <span class="token keyword">this</span><span class="token punctuation">.</span>bodyParser<span class="token punctuation">.</span>isFinished<span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token keyword">get</span> <span class="token function">response</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>statusLine<span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">HTTP\/1.1 ([0-9]+) ([\s\S]+)</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token punctuation">&#123;</span>
      <span class="token literal-property property">statusCode</span><span class="token operator">:</span> RegExp<span class="token punctuation">.</span>$1<span class="token punctuation">,</span>
      <span class="token literal-property property">statusText</span><span class="token operator">:</span> RegExp<span class="token punctuation">.</span>$2<span class="token punctuation">,</span>
      <span class="token literal-property property">headers</span><span class="token operator">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">,</span>
      <span class="token literal-property property">body</span><span class="token operator">:</span> <span class="token keyword">this</span><span class="token punctuation">.</span>bodyParser<span class="token punctuation">.</span>content<span class="token punctuation">.</span><span class="token function">join</span><span class="token punctuation">(</span><span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token punctuation">&#125;</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token function">receive</span><span class="token punctuation">(</span><span class="token parameter">string</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> string<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token function">receiveChar</span><span class="token punctuation">(</span>string<span class="token punctuation">.</span><span class="token function">charAt</span><span class="token punctuation">(</span>i<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token function">receiveChar</span><span class="token punctuation">(</span><span class="token parameter">char</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token comment">// status line (WAITING_STATUS_LINE -> WAITING_STATUS_LINE_END)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_STATUS_LINE</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>char <span class="token operator">===</span> <span class="token string">"\r"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_STATUS_LINE_END</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>char <span class="token operator">===</span> <span class="token string">"\n"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_NAME</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>statusLine <span class="token operator">+=</span> char<span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token comment">// status line ended, and headers start</span>
    <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_STATUS_LINE_END</span> <span class="token operator">&amp;&amp;</span> char <span class="token operator">===</span> <span class="token string">"\n"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_NAME</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token comment">// get key-value from headers</span>
    <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_NAME</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>char <span class="token operator">===</span> <span class="token string">":"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_SPACE</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>char <span class="token operator">===</span> <span class="token string">"\r"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token comment">// end headers</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_BLOCK_END</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>headerName <span class="token operator">+=</span> char<span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_BLOCK_END</span> <span class="token operator">&amp;&amp;</span>
      char <span class="token operator">===</span> <span class="token string">"\n"</span>
    <span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY</span><span class="token punctuation">;</span>
      <span class="token comment">// body parser creates</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span><span class="token string">"Transfer-Encoding"</span><span class="token punctuation">]</span> <span class="token operator">===</span> <span class="token string">"chunked"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>bodyParser <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TrunkedBodyParser</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token comment">// one name of the headers ended</span>
    <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_SPACE</span> <span class="token operator">&amp;&amp;</span> char <span class="token operator">===</span> <span class="token string">" "</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_VALUE</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token comment">// header value starts</span>
    <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_VALUE</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>char <span class="token operator">===</span> <span class="token string">"\r"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_LINE_END</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>headers<span class="token punctuation">[</span><span class="token keyword">this</span><span class="token punctuation">.</span>headerName<span class="token punctuation">]</span> <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>headerValue<span class="token punctuation">;</span>
        <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>headerName <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>headerValue <span class="token operator">=</span> <span class="token string">""</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>headerValue <span class="token operator">+=</span> char<span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token comment">// one value of the headers ended</span>
    <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_LINE_END</span> <span class="token operator">&amp;&amp;</span> char <span class="token operator">===</span> <span class="token string">"\n"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_HEADER_NAME</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token comment">// body starts</span>
    <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>bodyParser<span class="token punctuation">.</span><span class="token function">receiveChar</span><span class="token punctuation">(</span>char<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">class</span> <span class="token class-name">TrunkedBodyParser</span> <span class="token punctuation">&#123;</span>
  <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_LENGTH</span> <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_LENGTH_LINE_END</span> <span class="token operator">=</span> <span class="token number">1</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">READIND_TRUNK</span> <span class="token operator">=</span> <span class="token number">2</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_NEW_LINE</span> <span class="token operator">=</span> <span class="token number">3</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_NEW_LINE_END</span> <span class="token operator">=</span> <span class="token number">4</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY_BLOCK</span> <span class="token operator">=</span> <span class="token number">5</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY_BLOCK_END</span> <span class="token operator">=</span> <span class="token number">6</span><span class="token punctuation">;</span>

    <span class="token keyword">this</span><span class="token punctuation">.</span>length <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>content <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>isFinished <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_LENGTH</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token function">receiveChar</span><span class="token punctuation">(</span><span class="token parameter">char</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_LENGTH</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span>char <span class="token operator">===</span> <span class="token string">"\r"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
          <span class="token comment">// console.log('finished', this.content)</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span>isFinished <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY_BLOCK</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
          <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_LENGTH_LINE_END</span><span class="token punctuation">;</span>
        <span class="token punctuation">&#125;</span>
      <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>length <span class="token operator">*=</span> <span class="token number">10</span><span class="token punctuation">;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>length <span class="token operator">+=</span> char<span class="token punctuation">.</span><span class="token function">charCodeAt</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span> <span class="token operator">-</span> <span class="token string">"0"</span><span class="token punctuation">.</span><span class="token function">charCodeAt</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_LENGTH_LINE_END</span> <span class="token operator">&amp;&amp;</span> char <span class="token operator">===</span> <span class="token string">"\n"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">READIND_TRUNK</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">READIND_TRUNK</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>content<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span>char<span class="token punctuation">)</span><span class="token punctuation">;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>length<span class="token operator">--</span><span class="token punctuation">;</span>
      <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>length <span class="token operator">===</span> <span class="token number">0</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
        <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_NEW_LINE</span><span class="token punctuation">;</span>
      <span class="token punctuation">&#125;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_NEW_LINE</span> <span class="token operator">&amp;&amp;</span> char <span class="token operator">===</span> <span class="token string">"\r"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_NEW_LINE_END</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_NEW_LINE_END</span> <span class="token operator">&amp;&amp;</span> char <span class="token operator">===</span> <span class="token string">"\n"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_LENGTH</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">===</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY_BLOCK</span> <span class="token operator">&amp;&amp;</span> char <span class="token operator">===</span> <span class="token string">"\n"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">this</span><span class="token punctuation">.</span>current <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span><span class="token constant">WAITING_BODY_BLOCK_END</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// 更新request的data事件</span>
connection<span class="token punctuation">.</span><span class="token function">on</span><span class="token punctuation">(</span><span class="token string">"data"</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token parameter">data</span><span class="token punctuation">)</span> <span class="token operator">=></span> <span class="token punctuation">&#123;</span>
  parser<span class="token punctuation">.</span><span class="token function">receive</span><span class="token punctuation">(</span>data<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>parser<span class="token punctuation">.</span>isFinished<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token function">resolve</span><span class="token punctuation">(</span>parser<span class="token punctuation">.</span>response<span class="token punctuation">)</span><span class="token punctuation">;</span>
    connection<span class="token punctuation">.</span><span class="token function">end</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>result:</p>
<p><img src="https://gitee.com/httishere/blog-image/raw/master/img/Xnip2021-09-13_20-58-02.jpg#id=FcaP8&amp;originHeight=192&amp;originWidth=485&amp;originalType=binary∶=1&amp;status=done&amp;style=none" alt=""></p>
<p>优化：</p>
<p>可以再增加状态机对 body 的<code>\r\n</code>进行再优化。</p>
<p><img src="https://gitee.com/httishere/blog-image/raw/master/img/Xnip2021-09-13_21-06-24.jpg#id=dEVol&amp;originHeight=191&amp;originWidth=403&amp;originalType=binary∶=1&amp;status=done&amp;style=none" alt=""></p>
<h3 id="有限状态机"><a href="#有限状态机" class="headerlink" title="有限状态机"></a>有限状态机</h3><p><a target="_blank" rel="noopener" href="http://www.ruanyifeng.com/blog/2013/09/finite-state_machine_for_javascript.html">阮老师的文章</a>，有空可以看看。</p>
<ul>
<li>每个状态都是一个机器<ul>
<li>在每个机器里，可以进行计算，存储，输出……</li>
<li>所有机器接受的输入都是一致的</li>
<li>状态机的每个机器本身没有状态（类似纯函数，无副作用）</li>
</ul>
</li>
<li>每个机器知道下一个状态<ul>
<li>每个机器都有确定的下一个状态（Moore）</li>
<li>每个机器根据输入决定下一个状态（Mealy）</li>
</ul>
</li>
</ul>
<h4 id="使用有限状态机处理字符串"><a href="#使用有限状态机处理字符串" class="headerlink" title="使用有限状态机处理字符串"></a>使用有限状态机处理字符串</h4><h5 id="在一个字符串中，找到字符”a”"><a href="#在一个字符串中，找到字符”a”" class="headerlink" title="在一个字符串中，找到字符”a”"></a>在一个字符串中，找到字符”a”</h5><pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">function</span> <span class="token function">findA</span><span class="token punctuation">(</span><span class="token parameter">str</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> str<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>str<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">===</span> <span class="token string">"a"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h5 id="在一个字符串中，找到字符”ab”"><a href="#在一个字符串中，找到字符”ab”" class="headerlink" title="在一个字符串中，找到字符”ab”"></a>在一个字符串中，找到字符”ab”</h5><pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">function</span> <span class="token function">findAb</span><span class="token punctuation">(</span><span class="token parameter">str</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">let</span> findAFlag <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> str<span class="token punctuation">.</span>length<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>str<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">===</span> <span class="token string">"a"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      findAFlag <span class="token operator">=</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>findAFlag <span class="token operator">===</span> <span class="token boolean">true</span> <span class="token operator">&amp;&amp;</span> str<span class="token punctuation">[</span>i<span class="token punctuation">]</span> <span class="token operator">===</span> <span class="token string">"b"</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
      <span class="token keyword">return</span> <span class="token boolean">true</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span> <span class="token keyword">else</span> <span class="token punctuation">&#123;</span>
      findAFlag <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h5 id="在一个字符串中，找到字符”abcdef”"><a href="#在一个字符串中，找到字符”abcdef”" class="headerlink" title="在一个字符串中，找到字符”abcdef”"></a>在一个字符串中，找到字符”abcdef”</h5><p>同上，使用<code>findAFlag</code>，<code>findBFlag</code>，<code>findCFlag</code>，<code>findDFlag</code>，<code>findEFlag</code>，<code>findFFlag</code>几个标志。</p>
<h4 id="JS-中的有限状态机（Mealy）"><a href="#JS-中的有限状态机（Mealy）" class="headerlink" title="JS 中的有限状态机（Mealy）"></a>JS 中的有限状态机（Mealy）</h4><p>每个函数是一个状态，函数参数就是输入，函数体内可以自由地处理每个状态的逻辑，返回值作为下一个状态。</p>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token keyword">function</span> <span class="token function">match</span><span class="token punctuation">(</span><span class="token parameter">str</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">let</span> state <span class="token operator">=</span> start<span class="token punctuation">;</span>
  <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> c <span class="token keyword">of</span> str<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span>c<span class="token punctuation">,</span> state<span class="token punctuation">)</span><span class="token punctuation">;</span>
    state <span class="token operator">=</span> <span class="token function">state</span><span class="token punctuation">(</span>c<span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token keyword">return</span> state <span class="token operator">===</span> end<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">function</span> <span class="token function">start</span><span class="token punctuation">(</span><span class="token parameter">c</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">===</span> <span class="token string">"a"</span><span class="token punctuation">)</span> <span class="token keyword">return</span> foundA<span class="token punctuation">;</span>
  <span class="token keyword">return</span> start<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token comment">// trap状态，一般用这种来表示一个最终状态</span>
<span class="token keyword">function</span> <span class="token function">end</span><span class="token punctuation">(</span><span class="token parameter">c</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">return</span> end<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>

<span class="token keyword">function</span> <span class="token function">foundA</span><span class="token punctuation">(</span><span class="token parameter">c</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">===</span> <span class="token string">"b"</span><span class="token punctuation">)</span> <span class="token keyword">return</span> foundB<span class="token punctuation">;</span>
  <span class="token keyword">return</span> start<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>

<span class="token keyword">function</span> <span class="token function">foundB</span><span class="token punctuation">(</span><span class="token parameter">c</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">===</span> <span class="token string">"c"</span><span class="token punctuation">)</span> <span class="token keyword">return</span> foundC<span class="token punctuation">;</span>
  <span class="token keyword">return</span> start<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">function</span> <span class="token function">foundC</span><span class="token punctuation">(</span><span class="token parameter">c</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">===</span> <span class="token string">"d"</span><span class="token punctuation">)</span> <span class="token keyword">return</span> foundD<span class="token punctuation">;</span>
  <span class="token keyword">return</span> start<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">function</span> <span class="token function">foundD</span><span class="token punctuation">(</span><span class="token parameter">c</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">===</span> <span class="token string">"e"</span><span class="token punctuation">)</span> <span class="token keyword">return</span> foundE<span class="token punctuation">;</span>
  <span class="token keyword">return</span> start<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>
<span class="token keyword">function</span> <span class="token function">foundE</span><span class="token punctuation">(</span><span class="token parameter">c</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>c <span class="token operator">===</span> <span class="token string">"f"</span><span class="token punctuation">)</span> <span class="token keyword">return</span> end<span class="token punctuation">;</span>
  <span class="token keyword">return</span> start<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span>

console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token function">match</span><span class="token punctuation">(</span><span class="token string">"abcddddef"</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="如何使用状态机处理类似”abcabx”这样的字符串"><a href="#如何使用状态机处理类似”abcabx”这样的字符串" class="headerlink" title="如何使用状态机处理类似”abcabx”这样的字符串"></a>如何使用状态机处理类似”abcabx”这样的字符串</h4><h4 id="如何使用状态机处理类似”abababx”这样的字符串"><a href="#如何使用状态机处理类似”abababx”这样的字符串" class="headerlink" title="如何使用状态机处理类似”abababx”这样的字符串"></a>如何使用状态机处理类似”abababx”这样的字符串</h4><h4 id="如何用状态机处理完全未知的-pattern"><a href="#如何用状态机处理完全未知的-pattern" class="headerlink" title="如何用状态机处理完全未知的 pattern"></a>如何用状态机处理完全未知的 pattern</h4><blockquote>
<p>参考：字符串 KMP 算法</p>
</blockquote>

                
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